Eva Mendes and Ryan Gosling Share Rare Moment

raved about the surprise birthday tribute her longtime love Ryan Gosling .

The Hollywood couple, who have been together since 2011 and share two children, have kept their romance studiously out of the public eye.

Although Mendes has referred to Gosling publicly as her 'husband,' they have never even confirmed whether they have officially gotten married.

However Gosling, 45, made a rare public display of their love on the Tonight Show this Thursday - her 52nd birthday - calling her up onstage without warning. 

He then astonished her by singing Happy Birthday to You accompanied by a high school marching band, who held up a flag wishing her: 'Happy Birthday, Eva!'

Mendes posted to Instagram two days later offering a 'huuuuge gracias' to the late-night talk show host and the marching band from 's North Bergen High School - as well as a sly warning to Gosling. 

'What a beautiful memory. And a special thank you to all the educators in the audience. We need you now more than ever,' she wrote.  

'Lastly, my man ….i’ll get you back for this,' wrote Mendes, adding a heart emoji and leaving open the possibility of her own tribute on his birthday in November.

However Gosling, 45, made a rare public display of their love on the Tonight Show this Thursday - her 52nd birthday - calling her up onstage without warning